How do I import stuff to my html, css and JavaScript repl?

I was bored and decided to follow some of the Material Design guide things for fun and it wants me to run this:
npm install @material/button
Heres the problem. I can't do that. I don't know where I'm supposed to do that or where I need to go to import it. Thanks

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then how do i use html and stuff with it @ch1ck3n